ABSTRACT: A new sauropod dinosaur, _Jiutaisaurus xidiensis_ gen. et sp. nov.
from the Cretaceous Quantou Formation exposed in Xidi village of Jiutai in
Jilin, Northeast China, is described in this paper. The remains consist of a
series of 18 articulated anterior and middle caudual vertebrae. It is
distinguished from other sauropods in its possession of a longitudinal ridge
on both sides of the middle caudal centra, amphicoelous anterior and middle
caudals, chevrons unforked at their distal ends, and deep chevron haemal
canal. The new material from Quantou Formation is significant for better
understanding the evolution and distributions of Sauropoda in the
Cretaceous.